Warn about template limits

[stan-sz]

Bicep version
Bicep CLI version 0.2.328 (a13b032)

Describe the bug
Documentation states about template limits. Bicep should warn/error on exceeding the limits. Ideally Bicep could emulate (heuristically?) the 4MB limit, if possible.

To Reproduce
Below is an example only for > 256 params, easily expandable to other syntax items. Bicep should warn or error out on exceeding the limit.

param p1 string
param p2 string
param p3 string
param p4 string
param p5 string
param p6 string
param p7 string
param p8 string
param p9 string
param p10 string
param p11 string
param p12 string
param p13 string
param p14 string
param p15 string
param p16 string
param p17 string
param p18 string
param p19 string
param p20 string
param p21 string
param p22 string
param p23 string
param p24 string
param p25 string
param p26 string
param p27 string
param p28 string
param p29 string
param p30 string
param p31 string
param p32 string
param p33 string
param p34 string
param p35 string
param p36 string
param p37 string
param p38 string
param p39 string
param p40 string
param p41 string
param p42 string
param p43 string
param p44 string
param p45 string
param p46 string
param p47 string
param p48 string
param p49 string
param p50 string
param p51 string
param p52 string
param p53 string
param p54 string
param p55 string
param p56 string
param p57 string
param p58 string
param p59 string
param p60 string
param p61 string
param p62 string
param p63 string
param p64 string
param p65 string
param p66 string
param p67 string
param p68 string
param p69 string
param p70 string
param p71 string
param p72 string
param p73 string
param p74 string
param p75 string
param p76 string
param p77 string
param p78 string
param p79 string
param p80 string
param p81 string
param p82 string
param p83 string
param p84 string
param p85 string
param p86 string
param p87 string
param p88 string
param p89 string
param p90 string
param p91 string
param p92 string
param p93 string
param p94 string
param p95 string
param p96 string
param p97 string
param p98 string
param p99 string
param p100 string
param p101 string
param p102 string
param p103 string
param p104 string
param p105 string
param p106 string
param p107 string
param p108 string
param p109 string
param p110 string
param p111 string
param p112 string
param p113 string
param p114 string
param p115 string
param p116 string
param p117 string
param p118 string
param p119 string
param p120 string
param p121 string
param p122 string
param p123 string
param p124 string
param p125 string
param p126 string
param p127 string
param p128 string
param p129 string
param p130 string
param p131 string
param p132 string
param p133 string
param p134 string
param p135 string
param p136 string
param p137 string
param p138 string
param p139 string
param p140 string
param p141 string
param p142 string
param p143 string
param p144 string
param p145 string
param p146 string
param p147 string
param p148 string
param p149 string
param p150 string
param p151 string
param p152 string
param p153 string
param p154 string
param p155 string
param p156 string
param p157 string
param p158 string
param p159 string
param p160 string
param p161 string
param p162 string
param p163 string
param p164 string
param p165 string
param p166 string
param p167 string
param p168 string
param p169 string
param p170 string
param p171 string
param p172 string
param p173 string
param p174 string
param p175 string
param p176 string
param p177 string
param p178 string
param p179 string
param p180 string
param p181 string
param p182 string
param p183 string
param p184 string
param p185 string
param p186 string
param p187 string
param p188 string
param p189 string
param p190 string
param p191 string
param p192 string
param p193 string
param p194 string
param p195 string
param p196 string
param p197 string
param p198 string
param p199 string
param p200 string
param p201 string
param p202 string
param p203 string
param p204 string
param p205 string
param p206 string
param p207 string
param p208 string
param p209 string
param p210 string
param p211 string
param p212 string
param p213 string
param p214 string
param p215 string
param p216 string
param p217 string
param p218 string
param p219 string
param p220 string
param p221 string
param p222 string
param p223 string
param p225 string
param p226 string
param p227 string
param p228 string
param p229 string
param p230 string
param p231 string
param p232 string
param p233 string
param p234 string
param p235 string
param p236 string
param p237 string
param p238 string
param p239 string
param p240 string
param p241 string
param p242 string
param p243 string
param p244 string
param p245 string
param p246 string
param p247 string
param p248 string
param p249 string
param p250 string
param p251 string
param p252 string
param p253 string
param p254 string
param p255 string
param p256 string
param p257 string
param p258 string
param p259 string
param p260 string

[majastrz]

The basic size limits and parameter/output count errors/warnings should be fairly easy to implement. Providing accurate size limit warnings will be difficult once loop support goes in. (The loop counts/array sizes can be influenced by parameters whose values we don't have.)

[alex-frankel]

good first issue for the basic limits like # of params, outputs, vars, resources

[stan-sz]

Related work item about template limit: #5100

[stan-sz]

@majastrz - is the 4MB limit of the ARM json? Do the non-significant whitespace characters matter? If a certain ARM template is above the limit can bicep produce an obfuscated/squashed ARM json with pretty-printing turned off?

[verschaevesiebe]

Hi, we have a client which has a very big setup and we've hit the 4MB limit.
We have no way of mitigating it. What do you propose as a solution ?

Throw Bicep out and go back to ARM linked templates and start crying? 😄
I'm logging another issue for this cause we see no way around it.

Thanks